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输出：[3,3,5,5,6,7]
解释：
滑动窗口的位置                最大值
---------------               -----
[1  3  -1] -3  5  3  6  7       3
 1 [3  -1  -3] 5  3  6  7       3
 1  3 [-1  -3  5] 3  6  7       5
 1  3  -1 [-3  5  3] 6  7       5
 1  3  -1  -3 [5  3  6] 7       6
 1  3  -1  -3  5 [3  6  7]      7
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p><strong>示例 2：</strong></p> <div class="language- line-numbers-mode"><pre class="language-text"><code>输入：nums = [1], k = 1
输出：[1]
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p><strong>提示：</strong></p> <ul><li><code>1 &lt;= nums.length &lt;= 105</code></li> <li><code>-104 &lt;= nums[i] &lt;= 104</code></li> <li><code>1 &lt;= k &lt;= nums.length</code></li></ul> <h5 id="解题思路"><a href="#解题思路" class="header-anchor">#</a> 解题思路</h5> <div class="language-shell line-numbers-mode"><pre class="language-shell"><code><span class="token number">1</span>. 可以使用前面讲解的单调栈解决
	如果遇到一个比前面的数都要大的数
	前面的元素都没用了，队头就是最大的
	保证了队列为递减序列
	
<span class="token number">2</span>.  使用二叉堆，思想是一样的，都是保证最大值在最前面
	即最大值一直在堆顶<span class="token punctuation">(</span>最大堆<span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><h5 id="二叉堆"><a href="#二叉堆" class="header-anchor">#</a> 二叉堆</h5> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">/**
 * @param {number[]} nums
 * @param {number} k
 * @return {number[]}
 */</span>


<span class="token keyword">function</span> <span class="token function">Node</span><span class="token punctuation">(</span><span class="token parameter">val<span class="token punctuation">,</span>index</span><span class="token punctuation">)</span><span class="token punctuation">{</span>

    <span class="token keyword">this</span><span class="token punctuation">.</span>val<span class="token operator">=</span>val
    <span class="token keyword">this</span><span class="token punctuation">.</span>index<span class="token operator">=</span>index
<span class="token punctuation">}</span>

<span class="token keyword">class</span> <span class="token class-name">maxHeap</span><span class="token punctuation">{</span>

    <span class="token comment">// 构造函数</span>
    <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token operator">=</span><span class="token punctuation">[</span><span class="token punctuation">]</span>
    <span class="token punctuation">}</span>

    <span class="token comment">// 交换</span>
    <span class="token function">swap</span><span class="token punctuation">(</span><span class="token parameter">i1<span class="token punctuation">,</span>i2</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">let</span> temp<span class="token operator">=</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>i1<span class="token punctuation">]</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>i1<span class="token punctuation">]</span><span class="token operator">=</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>i2<span class="token punctuation">]</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>i2<span class="token punctuation">]</span><span class="token operator">=</span>temp
    <span class="token punctuation">}</span>

    <span class="token comment">// 获取父节点</span>

    <span class="token function">getParentIndex</span><span class="token punctuation">(</span><span class="token parameter">index</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token punctuation">(</span>index<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token operator">&gt;&gt;</span><span class="token number">1</span>
    <span class="token punctuation">}</span>

    <span class="token function">getLeftIndex</span><span class="token punctuation">(</span><span class="token parameter">index</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">return</span> index<span class="token operator">*</span><span class="token number">2</span><span class="token operator">+</span><span class="token number">1</span>
    <span class="token punctuation">}</span>

    <span class="token function">getRightIndex</span><span class="token punctuation">(</span><span class="token parameter">index</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">return</span> index<span class="token operator">*</span><span class="token number">2</span><span class="token operator">+</span><span class="token number">2</span>
    <span class="token punctuation">}</span>

    <span class="token comment">// 下移操作</span>

    <span class="token function">shiftDown</span><span class="token punctuation">(</span><span class="token parameter">index</span><span class="token punctuation">)</span><span class="token punctuation">{</span>

        <span class="token comment">// 当前节点往下走</span>
        <span class="token keyword">let</span> left<span class="token operator">=</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getLeftIndex</span><span class="token punctuation">(</span>index<span class="token punctuation">)</span>
        <span class="token keyword">let</span> right<span class="token operator">=</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getRightIndex</span><span class="token punctuation">(</span>index<span class="token punctuation">)</span>

        <span class="token comment">// 左边和右边都有，跟大的换</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>left<span class="token punctuation">]</span><span class="token operator">&amp;&amp;</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>right<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            
            <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>left<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token operator">&gt;</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>right<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token operator">&amp;&amp;</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>left<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token operator">&gt;</span>
                <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">.</span>val
            <span class="token punctuation">)</span><span class="token punctuation">{</span>
                <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">swap</span><span class="token punctuation">(</span>index<span class="token punctuation">,</span>left<span class="token punctuation">)</span>
                <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftDown</span><span class="token punctuation">(</span>left<span class="token punctuation">)</span>
            <span class="token punctuation">}</span><span class="token keyword">else</span> <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>left<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token operator">&lt;=</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>right<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token operator">&amp;&amp;</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>right<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token operator">&gt;</span>
                <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token punctuation">)</span><span class="token punctuation">{</span>
                <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">swap</span><span class="token punctuation">(</span>index<span class="token punctuation">,</span>right<span class="token punctuation">)</span>
                <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftDown</span><span class="token punctuation">(</span>right<span class="token punctuation">)</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>

            <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>left<span class="token punctuation">]</span><span class="token operator">&amp;&amp;</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>left<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token operator">&gt;</span>
                <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token punctuation">)</span><span class="token punctuation">{</span>

                <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">swap</span><span class="token punctuation">(</span>index<span class="token punctuation">,</span>left<span class="token punctuation">)</span>
                <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftDown</span><span class="token punctuation">(</span>left<span class="token punctuation">)</span>
            <span class="token punctuation">}</span>

            <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>right<span class="token punctuation">]</span><span class="token operator">&amp;&amp;</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>right<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token operator">&gt;</span>
                <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token punctuation">)</span><span class="token punctuation">{</span>
                
                <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">swap</span><span class="token punctuation">(</span>index<span class="token punctuation">,</span>right<span class="token punctuation">)</span>
                <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftDown</span><span class="token punctuation">(</span>right<span class="token punctuation">)</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>

        

    <span class="token punctuation">}</span>

    <span class="token comment">// 上移操作</span>

    <span class="token function">shiftUp</span><span class="token punctuation">(</span><span class="token parameter">index</span><span class="token punctuation">)</span><span class="token punctuation">{</span>

        <span class="token keyword">if</span><span class="token punctuation">(</span>index<span class="token operator">===</span><span class="token number">0</span><span class="token punctuation">)</span> <span class="token keyword">return</span> 

        <span class="token keyword">let</span> parent<span class="token operator">=</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getParentIndex</span><span class="token punctuation">(</span>index<span class="token punctuation">)</span>

        <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token operator">&gt;</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>parent<span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">swap</span><span class="token punctuation">(</span>index<span class="token punctuation">,</span>parent<span class="token punctuation">)</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftUp</span><span class="token punctuation">(</span>parent<span class="token punctuation">)</span>
        <span class="token punctuation">}</span>

    <span class="token punctuation">}</span>

    <span class="token comment">// 添加元素</span>
    <span class="token function">push</span><span class="token punctuation">(</span><span class="token parameter">node</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>node<span class="token punctuation">)</span>

        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftUp</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">.</span>length<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>

    <span class="token comment">// 删除堆顶</span>

    <span class="token function">pop</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">.</span>length<span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">let</span> top<span class="token operator">=</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token operator">=</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">.</span><span class="token function">pop</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftDown</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span>

            <span class="token keyword">return</span> top
        <span class="token punctuation">}</span>

        <span class="token keyword">return</span> <span class="token keyword">undefined</span>
    <span class="token punctuation">}</span>



<span class="token punctuation">}</span>

<span class="token keyword">var</span> <span class="token function-variable function">maxSlidingWindow</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">nums<span class="token punctuation">,</span> k</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>

    <span class="token comment">// 使用最大堆</span>

    <span class="token comment">// 堆顶永远是最大值</span>

    <span class="token comment">// 到达k时，我们每加入一个节点，就有一个过期，需要删除</span>

    <span class="token comment">// 但是这个需要删除的节点不一定在堆顶，所以我们只要标记一下就行</span>

    <span class="token keyword">let</span> h<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">maxHeap</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

    <span class="token comment">// console.log(h.heap) </span>

    <span class="token keyword">let</span> res<span class="token operator">=</span><span class="token punctuation">[</span><span class="token punctuation">]</span>

    <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">let</span> i<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>i<span class="token operator">&lt;</span>k<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">let</span> node<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">Node</span><span class="token punctuation">(</span>nums<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">,</span>i<span class="token punctuation">)</span>
        h<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>node<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>

    <span class="token comment">// console.log(h.heap)</span>

    <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">let</span> i<span class="token operator">=</span>k<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>i<span class="token operator">&lt;</span>nums<span class="token punctuation">.</span>length<span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">let</span> node<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">Node</span><span class="token punctuation">(</span>nums<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">,</span>i<span class="token punctuation">)</span>
        h<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>node<span class="token punctuation">)</span>
        <span class="token comment">// console.log(h.heap)</span>

        <span class="token comment">// 输出堆顶</span>
        <span class="token comment">// 判断堆顶是否过期</span>
        <span class="token comment">// console.log(h.heap[0].index,i-k)</span>
        <span class="token keyword">while</span><span class="token punctuation">(</span>h<span class="token punctuation">.</span>heap<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>index<span class="token operator">&lt;=</span><span class="token punctuation">(</span>i<span class="token operator">-</span>k<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment">// console.log(1)</span>
            h<span class="token punctuation">.</span><span class="token function">pop</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span>
        res<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>h<span class="token punctuation">.</span>heap<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>val<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>

    <span class="token comment">// console.log(res)</span>


    <span class="token keyword">return</span> res
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span 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class="line-number">125</span><br><span class="line-number">126</span><br><span class="line-number">127</span><br><span class="line-number">128</span><br><span class="line-number">129</span><br><span class="line-number">130</span><br><span class="line-number">131</span><br><span class="line-number">132</span><br><span class="line-number">133</span><br><span class="line-number">134</span><br><span class="line-number">135</span><br><span class="line-number">136</span><br><span class="line-number">137</span><br><span class="line-number">138</span><br><span class="line-number">139</span><br><span class="line-number">140</span><br><span class="line-number">141</span><br><span class="line-number">142</span><br><span class="line-number">143</span><br><span class="line-number">144</span><br><span class="line-number">145</span><br><span class="line-number">146</span><br><span class="line-number">147</span><br><span class="line-number">148</span><br><span class="line-number">149</span><br><span class="line-number">150</span><br><span class="line-number">151</span><br><span class="line-number">152</span><br><span class="line-number">153</span><br><span class="line-number">154</span><br><span class="line-number">155</span><br><span class="line-number">156</span><br><span class="line-number">157</span><br><span class="line-number">158</span><br><span class="line-number">159</span><br><span class="line-number">160</span><br><span class="line-number">161</span><br><span class="line-number">162</span><br><span class="line-number">163</span><br><span class="line-number">164</span><br><span class="line-number">165</span><br><span class="line-number">166</span><br></div></div><h4 id="_355-设计推特"><a href="#_355-设计推特" class="header-anchor">#</a> 355. 设计推特</h4> <p>设计一个简化版的推特(Twitter)，可以让用户实现发送推文，关注/取消关注其他用户，能够看见关注人（包括自己）的最近 <code>10</code> 条推文。</p> <p>实现 <code>Twitter</code> 类：</p> <ul><li><code>Twitter()</code> 初始化简易版推特对象</li> <li><code>void postTweet(int userId, int tweetId)</code> 根据给定的 <code>tweetId</code> 和 <code>userId</code> 创建一条新推文。每次调用此函数都会使用一个不同的 <code>tweetId</code> 。</li> <li><code>List&lt;Integer&gt; getNewsFeed(int userId)</code> 检索当前用户新闻推送中最近 <code>10</code> 条推文的 ID 。新闻推送中的每一项都必须是由用户关注的人或者是用户自己发布的推文。推文必须 <strong>按照时间顺序由最近到最远排序</strong> 。</li> <li><code>void follow(int followerId, int followeeId)</code> ID 为 <code>followerId</code> 的用户开始关注 ID 为 <code>followeeId</code> 的用户。</li> <li><code>void unfollow(int followerId, int followeeId)</code> ID 为 <code>followerId</code> 的用户不再关注 ID 为 <code>followeeId</code> 的用户。</li></ul> <p><strong>示例：</strong></p> <div class="language- line-numbers-mode"><pre class="language-text"><code>输入
[&quot;Twitter&quot;, &quot;postTweet&quot;, &quot;getNewsFeed&quot;, &quot;follow&quot;, &quot;postTweet&quot;, &quot;getNewsFeed&quot;, &quot;unfollow&quot;, &quot;getNewsFeed&quot;]
[[], [1, 5], [1], [1, 2], [2, 6], [1], [1, 2], [1]]
输出
[null, null, [5], null, null, [6, 5], null, [5]]

解释
Twitter twitter = new Twitter();
twitter.postTweet(1, 5); // 用户 1 发送了一条新推文 (用户 id = 1, 推文 id = 5)
twitter.getNewsFeed(1);  // 用户 1 的获取推文应当返回一个列表，其中包含一个 id 为 5 的推文
twitter.follow(1, 2);    // 用户 1 关注了用户 2
twitter.postTweet(2, 6); // 用户 2 发送了一个新推文 (推文 id = 6)
twitter.getNewsFeed(1);  // 用户 1 的获取推文应当返回一个列表，其中包含两个推文，id 分别为 -&gt; [6, 5] 。推文 id 6 应当在推文 id 5 之前，因为它是在 5 之后发送的
twitter.unfollow(1, 2);  // 用户 1 取消关注了用户 2
twitter.getNewsFeed(1);  // 用户 1 获取推文应当返回一个列表，其中包含一个 id 为 5 的推文。因为用户 1 已经不再关注用户 2
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br></div></div><p><strong>提示：</strong></p> <ul><li><code>1 &lt;= userId, followerId, followeeId &lt;= 500</code></li> <li><code>0 &lt;= tweetId &lt;= 104</code></li> <li>所有推特的 ID 都互不相同</li> <li><code>postTweet</code>、<code>getNewsFeed</code>、<code>follow</code> 和 <code>unfollow</code> 方法最多调用 <code>3 * 104</code> 次</li></ul> <h5 id="解题思路-2"><a href="#解题思路-2" class="header-anchor">#</a> 解题思路</h5> <div class="language-shell line-numbers-mode"><pre class="language-shell"><code><span class="token number">1</span>. 每个用户都有自己的推文
<span class="token number">2</span>. 一个用户可以关注另一个用户
<span class="token number">3</span>. 获取一个用户的推文时会获取自己的和关注的人的
<span class="token number">4</span>. 获取的推文按时间先后排序
<span class="token number">5</span>. 每次获取的推文的数量为10

其实就是合并k个有序链表，k是动态变化的
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><h5 id="完整代码"><a href="#完整代码" class="header-anchor">#</a> 完整代码</h5> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">class</span> <span class="token class-name">maxHeap</span> <span class="token punctuation">{</span>
  <span class="token comment">// 构造函数</span>
  <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>heap <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>
  <span class="token punctuation">}</span>

  <span class="token comment">// 交换</span>
  <span class="token function">swap</span><span class="token punctuation">(</span><span class="token parameter">i1<span class="token punctuation">,</span> i2</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> temp <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>i1<span class="token punctuation">]</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>i1<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>i2<span class="token punctuation">]</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>i2<span class="token punctuation">]</span> <span class="token operator">=</span> temp
  <span class="token punctuation">}</span>

  <span class="token comment">// 获取父节点</span>

  <span class="token function">getParentIndex</span><span class="token punctuation">(</span><span class="token parameter">index</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">(</span>index <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">&gt;&gt;</span> <span class="token number">1</span>
  <span class="token punctuation">}</span>

  <span class="token function">getLeftIndex</span><span class="token punctuation">(</span><span class="token parameter">index</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> index <span class="token operator">*</span> <span class="token number">2</span> <span class="token operator">+</span> <span class="token number">1</span>
  <span class="token punctuation">}</span>

  <span class="token function">getRightIndex</span><span class="token punctuation">(</span><span class="token parameter">index</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> index <span class="token operator">*</span> <span class="token number">2</span> <span class="token operator">+</span> <span class="token number">2</span>
  <span class="token punctuation">}</span>

  <span class="token comment">// 下移操作</span>

  <span class="token function">shiftDown</span><span class="token punctuation">(</span><span class="token parameter">index</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// 当前节点往下走</span>
    <span class="token keyword">let</span> left <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getLeftIndex</span><span class="token punctuation">(</span>index<span class="token punctuation">)</span>
    <span class="token keyword">let</span> right <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getRightIndex</span><span class="token punctuation">(</span>index<span class="token punctuation">)</span>

    <span class="token comment">// 左边和右边都有，跟大的换</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>left<span class="token punctuation">]</span> <span class="token operator">&amp;&amp;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>right<span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>left<span class="token punctuation">]</span><span class="token punctuation">.</span>time <span class="token operator">&gt;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>right<span class="token punctuation">]</span><span class="token punctuation">.</span>time <span class="token operator">&amp;&amp;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>left<span class="token punctuation">]</span><span class="token punctuation">.</span>time <span class="token operator">&gt;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">.</span>time
      <span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">swap</span><span class="token punctuation">(</span>index<span class="token punctuation">,</span> left<span class="token punctuation">)</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftDown</span><span class="token punctuation">(</span>left<span class="token punctuation">)</span>
      <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>left<span class="token punctuation">]</span><span class="token punctuation">.</span>time <span class="token operator">&lt;=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>right<span class="token punctuation">]</span><span class="token punctuation">.</span>time <span class="token operator">&amp;&amp;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>right<span class="token punctuation">]</span><span class="token punctuation">.</span>time <span class="token operator">&gt;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">.</span>time
      <span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">swap</span><span class="token punctuation">(</span>index<span class="token punctuation">,</span> right<span class="token punctuation">)</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftDown</span><span class="token punctuation">(</span>right<span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>left<span class="token punctuation">]</span> <span class="token operator">&amp;&amp;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>left<span class="token punctuation">]</span><span class="token punctuation">.</span>time <span class="token operator">&gt;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">.</span>time<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">swap</span><span class="token punctuation">(</span>index<span class="token punctuation">,</span> left<span class="token punctuation">)</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftDown</span><span class="token punctuation">(</span>left<span class="token punctuation">)</span>
      <span class="token punctuation">}</span>

      <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>right<span class="token punctuation">]</span> <span class="token operator">&amp;&amp;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>right<span class="token punctuation">]</span><span class="token punctuation">.</span>time <span class="token operator">&gt;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">.</span>time<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">swap</span><span class="token punctuation">(</span>index<span class="token punctuation">,</span> right<span class="token punctuation">)</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftDown</span><span class="token punctuation">(</span>right<span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>

  <span class="token comment">// 上移操作</span>

  <span class="token function">shiftUp</span><span class="token punctuation">(</span><span class="token parameter">index</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>index <span class="token operator">===</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token keyword">return</span>

    <span class="token keyword">let</span> parent <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getParentIndex</span><span class="token punctuation">(</span>index<span class="token punctuation">)</span>
    <span class="token comment">// console.log(this.heap)</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">.</span>time <span class="token operator">&gt;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span>parent<span class="token punctuation">]</span><span class="token punctuation">.</span>time<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">swap</span><span class="token punctuation">(</span>index<span class="token punctuation">,</span> parent<span class="token punctuation">)</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftUp</span><span class="token punctuation">(</span>parent<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>

  <span class="token comment">// 添加元素</span>
  <span class="token function">push</span><span class="token punctuation">(</span><span class="token parameter">node</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>node<span class="token punctuation">)</span>

    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftUp</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">.</span>length <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>

  <span class="token comment">// 删除堆顶</span>

  <span class="token function">pop</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">.</span>length<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">.</span>length <span class="token operator">===</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">.</span><span class="token function">shift</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
      <span class="token keyword">let</span> top <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>heap<span class="token punctuation">.</span><span class="token function">pop</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">shiftDown</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span>

      <span class="token keyword">return</span> top
    <span class="token punctuation">}</span>

    <span class="token keyword">return</span> <span class="token keyword">undefined</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token comment">// 题目的本质其实就是合并k个有序链表，时间序</span>

<span class="token keyword">function</span> <span class="token function">Node</span><span class="token punctuation">(</span><span class="token parameter">val<span class="token punctuation">,</span> time</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>val <span class="token operator">=</span> val
  <span class="token keyword">this</span><span class="token punctuation">.</span>time <span class="token operator">=</span> time
  <span class="token keyword">this</span><span class="token punctuation">.</span>next <span class="token operator">=</span> <span class="token keyword">null</span>
<span class="token punctuation">}</span>

<span class="token keyword">var</span> <span class="token function-variable function">Twitter</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token comment">// 用户数组</span>

  <span class="token comment">// 存放每个用户的链表</span>

  <span class="token comment">// 存放user -&gt; user的所有推文的映射</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>Nodemap <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Map</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

  <span class="token comment">// 存放当前user -&gt; 其好友的映射</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>followMap <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Map</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>user <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>

  <span class="token comment">// 下一次的时间</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>nextTime <span class="token operator">=</span> <span class="token number">0</span>
<span class="token punctuation">}</span>

<span class="token comment">/**
 * @param {number} userId
 * @param {number} tweetId
 * @return {void}
 */</span>
<span class="token class-name">Twitter</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">postTweet</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">userId<span class="token punctuation">,</span> tweetId</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> node <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Node</span><span class="token punctuation">(</span>tweetId<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>nextTime<span class="token punctuation">)</span>
  <span class="token comment">// console.log(node)</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>nextTime<span class="token operator">++</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>Nodemap<span class="token punctuation">.</span><span class="token function">has</span><span class="token punctuation">(</span>userId<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    node<span class="token punctuation">.</span>next <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>Nodemap<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>userId<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>Nodemap<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span>userId<span class="token punctuation">,</span> node<span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token comment">/**
 * @param {number} userId
 * @return {number[]}
 */</span>
<span class="token class-name">Twitter</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">getNewsFeed</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">userId</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token comment">// 看当前用户有没有好友</span>

  <span class="token comment">// 需要合并的链表</span>
  <span class="token keyword">let</span> arr <span class="token operator">=</span> <span class="token punctuation">[</span>userId<span class="token punctuation">]</span>

  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>followMap<span class="token punctuation">.</span><span class="token function">has</span><span class="token punctuation">(</span>userId<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// console.log(this.followMap.get(userId), 'friend')</span>
    arr <span class="token operator">=</span> arr<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>followMap<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>userId<span class="token punctuation">)</span><span class="token punctuation">)</span>
    <span class="token comment">// arr.push()</span>
  <span class="token punctuation">}</span>

  <span class="token keyword">let</span> h <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">maxHeap</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

  <span class="token keyword">if</span> <span class="token punctuation">(</span>arr<span class="token punctuation">.</span>length <span class="token operator">===</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> res <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>
    <span class="token keyword">let</span> p <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>Nodemap<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>userId<span class="token punctuation">)</span>
    <span class="token keyword">while</span> <span class="token punctuation">(</span>p <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>p<span class="token punctuation">.</span>val<span class="token punctuation">)</span>
      res<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>p<span class="token punctuation">.</span>val<span class="token punctuation">)</span>
      p <span class="token operator">=</span> p<span class="token punctuation">.</span>next
    <span class="token punctuation">}</span>
    <span class="token keyword">return</span> res<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">10</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> res <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>
    <span class="token comment">// 进行链表合并</span>
    <span class="token comment">// 最大堆，时间最大的放在堆顶</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> arr<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">let</span> node <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>Nodemap<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>arr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span>
    <span class="token comment">//   console.log(node, 'test', arr)</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>node<span class="token punctuation">)</span><span class="token punctuation">{</span>
        h<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>node<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
      
    <span class="token punctuation">}</span>

    <span class="token keyword">while</span> <span class="token punctuation">(</span>h<span class="token punctuation">.</span>heap<span class="token punctuation">.</span>length<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token comment">// console.log(1)</span>

      <span class="token keyword">let</span> top <span class="token operator">=</span> h<span class="token punctuation">.</span><span class="token function">pop</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

      res<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>top<span class="token punctuation">.</span>val<span class="token punctuation">)</span>

      <span class="token keyword">if</span> <span class="token punctuation">(</span>top<span class="token punctuation">.</span>next<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        h<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>top<span class="token punctuation">.</span>next<span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">return</span> res<span class="token punctuation">.</span>slice
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token comment">/**
 * @param {number} followerId
 * @param {number} followeeId
 * @return {void}
 */</span>
<span class="token class-name">Twitter</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">follow</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">followerId<span class="token punctuation">,</span> followeeId</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> users <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>followMap<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>followerId<span class="token punctuation">)</span>

  <span class="token keyword">if</span> <span class="token punctuation">(</span>users<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// // console.log(users)</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>users<span class="token punctuation">.</span><span class="token function">includes</span><span class="token punctuation">(</span>followeeId<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">return</span>
    <span class="token comment">// console.log(users, '111')</span>
    users<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>followeeId<span class="token punctuation">)</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>followMap<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span>followerId<span class="token punctuation">,</span> users<span class="token punctuation">)</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> arr <span class="token operator">=</span> Array<span class="token punctuation">.</span><span class="token function">from</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
    arr<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>followeeId<span class="token punctuation">)</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>followMap<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span>followerId<span class="token punctuation">,</span> arr<span class="token punctuation">)</span>

    <span class="token comment">// console.log(this.followMap.get(followerId), '666')</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token comment">/**
 * @param {number} followerId
 * @param {number} followeeId
 * @return {void}
 */</span>
<span class="token class-name">Twitter</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">unfollow</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">followerId<span class="token punctuation">,</span> followeeId</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> users <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>followMap<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>followerId<span class="token punctuation">)</span>
  <span class="token comment">// console.log(users, '112')</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>users<span class="token punctuation">)</span> <span class="token keyword">return</span>

  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>users<span class="token punctuation">.</span><span class="token function">includes</span><span class="token punctuation">(</span>followeeId<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">return</span>

  <span class="token keyword">let</span> res <span class="token operator">=</span> users<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">item</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> item <span class="token operator">!==</span> followeeId<span class="token punctuation">)</span>

  <span class="token keyword">this</span><span class="token punctuation">.</span>followMap<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span>followerId<span class="token punctuation">,</span> res<span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token comment">/**
 * Your Twitter object will be instantiated and called as such:
 * var obj = new Twitter()
 * obj.postTweet(userId,tweetId)
 * var param_2 = obj.getNewsFeed(userId)
 * obj.follow(followerId,followeeId)
 * obj.unfollow(followerId,followeeId)
 */</span>

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